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A hard disk drive ( HDD ), hard disk, hard drive, or fixed disk [a] is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating platters coated with magnetic material.
Big data primarily refers to data sets that are too large or complex to be dealt with by traditional data-processing application software. Data with many entries (rows) offer greater statistical power, while data with higher complexity (more attributes or columns) may lead to a higher false discovery rate. [2] .
- Definition
- History
- Types
- Software Development and Maintenance
- Quality and Security
- Encoding and Execution
- Legal Issues
- Impact
Software can be defined more narrowly as the instructions executed by the computer hardware, or more broadly including other concepts, tools, and methods needed to make an executable system on computer hardware, such as design documents, specifications, and testing suites. An individual program or source code file consists of unambiguous instructio...
A host of earlier inventions were necessary for the creation of software, including mathematics—especially binary and decimal number systems, and zero—alphabets, writing, mechanical calculators, boolean algebra, transistors, integrated circuits, and plastics. Software could not exist without digital computers, as it was created specifically for the...
There are two main types of software: 1. Operating systems are "the layer of software that manages a computer's resources for its users and their applications". There are three main purposes that an operating system fulfills: 1.1. Allocating resources between different applications, deciding when they will receive central processing unit (CPU) time...
Software companies aim to deliver a high-quality product on time and under budget. A challenge is that software development effort estimation is often inaccurate. Software development begins by conceiving the project, evaluating its feasibility, analyzing the business requirements, and making a software design. Most software projects speed up their...
Software quality is defined as meeting the stated requirements as well as customer expectations. Quality is an overarching term that can refer to a code's correct and efficient behavior, its reusability and portability, or the ease of modification. It is usually more cost-effective to build quality into the product from the beginning rather than tr...
Programming languages
Programming languages are the format in which software is written. Since the 1950s, thousands of different programming languages have been invented; some have been in use for decades, while others have fallen into disuse. Some definitions classify machine code—the exact instructions directly implemented by the hardware—and assembly language—a more human-readable alternative to machine code whose statements can be translated one-to-one into machine code—as programming languages. Programs writt...
Compilation, interpretation, and execution
The invention of high-level programming languages was simultaneous with the compilers needed to translate them automatically into machine code. Most programs do not contain all the resources needed to run them and rely on external libraries. Part of the compiler's function is to link these files in such a way that the program can be executed by the hardware. Once compiled, the program can be saved as an object file and the loader (part of the operating system) can take this saved file and exe...
Liability
Software is often released with the knowledge that it is incomplete or contains bugs. Purchasers knowingly buy it in this state, which has led to a legal regime where liabilityfor software products is significantly curtailed compared to other products.
Licenses
Source code is protected by copyright law that vests the owner with the exclusive right to copy the code. The underlying ideas or algorithms are not protected by copyright law, but are often treated as a trade secret and concealed by such methods as non-disclosure agreements. Software copyright has been recognized since the mid-1970s and is vested in the company that makes the software, not the employees or contractors who wrote it. The use of most software is governed by an agreement (softwa...
Patents
Patents give an inventor an exclusive, time-limited license for a novel product or process. Ideas about what software could accomplish are not protected by law and concrete implementations are instead covered by copyright law. In some countries, a requirement for the claimed invention to have an effect on the physical world may also be part of the requirements for a software patent to be held valid. Software patents have been historically controversial. Before the 1998 case State Street Bank...
Engineer Capers Jones writes that "computers and software are making profound changes to every aspect of human life: education, work, warfare, entertainment, medicine, law, and everything else". It has become ubiquitous in everyday life in developed countries. In many cases, software augments the functionality of existing technologies such as house...
A storage device is computer hardware or digital media that is used for storing, porting, and extracting data files and objects. It can hold and store information either temporarily or permanently and can be internal or external to a computer. Data storage is a core function and fundamental component of computers.
Wikipedia is a free content online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the wiki software MediaWiki.Wikipedia is the largest and most-read reference work in history, and is consistently ranked among the ten most visited websites; as of May 2024, it was ranked fourth by Semrush, and sixth by Similarweb.
Launched on April 24, 2012, Google Drive allows users to store files in the cloud (on Google's servers), synchronize files across devices, and share files. In addition to a web interface, Google Drive offers apps with offline capabilities for Windows and macOS computers, and Android and iOS smartphones and tablets.
This list comprises the world's largest companies by consolidated revenue, according to the Fortune Global 500 2023 rankings and other sources. [2] American retail corporation Walmart has been the world's largest company by revenue since 2014. [1]
